Question

A,B两地相距1200千米,甲从A地,乙从B地同时出发,相向而行,甲每小时行50千米,乙每

Answer 1

设AC距离为x m,AD距离为y m

x/50=(1200-x)/70

7x=1200*5-5x

12x=1200*5

x=500m

(1200+1200-y)/50=(1200+y)/70

(2400-y)/5=(1200+y)/7

2400*7-7y=1200*5+5y

1200*(14-5)=12y

y=900m

CD=AD-AC=y-x=900-500=400m

A、C之间距离是500m,C、D两地的距离是400m